171010502 WURTH

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Technical content

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 1/39 2.5V – 5.5V / 1A / 0.8V – 5.5V Output

DESCRIPTION

The VDMM 171010502 MagI3C MicroModule provides a fully integrated DC -DC power supply including the switching regulator with integrated MOSFETs , compensation , shielded inductor and input capacitor in one package. The 171010502 offers high efficiency and delivers up to 1A of output current. It operates with an input voltage from 2.5V to 5.5V and is designed for a small solution size . The selectable forced PWM or PFM/PWM mode allows for the choice between high efficiency and low output voltage ripple at light load. It is available in a n LGA-6EP package ( 3.2 x 2.5 x 1.55mm ). This module h as integrated protection circuitry that guards against thermal ov erstress with thermal shutdown and protects agains t electrical damage using overcurrent, short-circuit and undervoltage protections. TYPICAL APPLICATIONS  General point of load power supply for low power systems  Replacement of linear regulators  DSP and FPGA power supply auxiliary voltages  Portable instru ments  Battery powered equipment TYPICAL CIRCUIT DIAGRAM

FEATURES

 Peak efficiency up to 96%  Current capability up to 1A  Input voltage range: 2.5V to 5.5V  Output voltage range: 0.8V to 5.5V  25 µA typical quiescent current  Integrated shielded indu ctor and input capacitor  Low output voltage ripple: ±6mV typ.  Output voltage accuracy over temperature : 2% max.  Fixed switching frequency: 4 MHz  Constant On-Time control  Synchronous operation  Selectable forced PWM or PFM/PWM mode  Undervoltage lockout protection (UVLO)  Embedded soft -start  Thermal shutdown  Short-circuit protection  Cycle-by-cycle current limit  RoHS und REACh compliant  Operating ambient temperature up to 85°C  Operating junction temp. range: -40 to 125°C  Complies with EN5503 2 class B radiated emissions standard VIN VOUT EN MODE CIN COUT RFBT FB PGND VIN VOUT RFBB CFF GND GND PGND EP Module

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 2/39 PACKAGE Top View Bottom view MARKING DESCRIPTION MARKING DESCRIPTION T56 Marking Coder y Date Code (year) w Date Code (month) PIN DESCRIPTION SYMBOL NUMBER TYPE DESCRIPTION VOUT 1 Power Output voltage. Place output capacitors as close as possible. For best thermal performance use copper plane(s) at this pin. MODE 2 Input Forced PWM or PFM/PWM mode selection pin. Setting this pin high, the forced PWM mode is selected for any load current. Setting this pin low, PFM/PWM is selected, with the transition automatically between the two operations according to the load. This pin must not be left floating. FB 3 Input Feedback pin. This pin must be connected to the external resistor divider (between VOUT and GND) to adjust the output voltage. VIN 4 Power Input voltage. Place the input capacitor as close as possible . EN 5 Input Enable pin. Setting this pin high enables the device, while setting this pin low shuts down the device. This pin must not be left floating. PGND 6 Power Power Ground. It must be connected to the ground plane and the Thermal Pads. PGND EP Exposed Pads Exposed Pads . These pins are internally electrically connected to PGND. It is recommended to connect them to the ground plane for device heat dissipation VOUT MODE FB VIN EN PGND T56 yw VOUT MODE FB VIN EN PGND PGND EP PGND EP PGND EP PGND EP

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 3/39

ORDERING INFORMATION

ORDER CODE SPECIFICATIONS PACKAGE PACKAGING UNIT 171010502 1A / 0.8-5.5Vout version LGA-6EP Reel (2000 pieces) 178010502 1A / 0.8-5.5Vout version Eval Board SALES INFORMATION SALES CONTACTS Würth Elektronik eiSos GmbH & Co. KG EMC & Inductive Solutions Max-Eyth-Str. 1

74638 Waldenb urg

Tel. +49 (0) 7942 945 0 www.we-online.com/powermodules Technical support: powermodules@we -online.com

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 4/39 ABSOLUTE MAXIMUM RATINGS Caution: Exceeding the listed absolute maximum ratings may affect the device negatively and may cause permanent damage. SYMBOL PARAMETER LIMITS UNIT MIN (1) MAX (1) VIN Input voltage -0.3 6 V VOUT Output voltage -0.3 VIN+0.3 V FB Feedback pin -0.3 VIN+0.3 V EN Enable pin -0.3 VIN+0.3 V MODE Mode pin -0.3 VIN+0.3 V Tstorage Assembled, non -operating storage temperature -65 150 °C VESD ESD voltage (HBM), all pins (C=100pF, R= 1.5kΩ) -4 4 kV OPERATING CONDITIONS Operating conditions are conditions u nder which the device is intended to be functional. All values are referenced to GND. MIN and MAX limits are valid for the recommended ambient temperature range of -40°C to 85°C. Typical values represent statistically the utmost probable values at the following conditions: VIN = 5V, VOUT = 1.8V, CIN = 4.7µF, COUT =10µF ceramic, unless otherwise noted. SYMBOL PARAMETER MIN (1) TYP (2) MAX (1) UNIT VIN Input voltage 2.5 - 5.5 V VOUT Output voltage (depending on the external resistor divider ) 0.8 - 5.5 V TA Ambient temperature range -40 - 85 (3) °C TJOP Junction temperature range -40 - 125 °C IOUT Nominal output current 1 A THERMAL SPECIFICATIONS SYMBOL PARAMETER TYP (2) UNIT ӨJA Junction-to-ambient thermal resistance (4) 150 °C/W TSD Thermal shu tdown, rising 160 °C Thermal shutdown hysteresis , falling 10 °C

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 5/39 ELECTRICAL SPECIFICATIONS MIN and MAX limits are valid for the recommended ambient temperature range of -40°C to 85°C. Typical values represents statistically the utmost probable values at the following conditions: VIN = 5V, VOUT = 1.8V, CIN = 4.7µF, COUT =10µF ceramic, unless otherwise noted. SYMBOL PARAMETER TEST CONDITIONS MIN (1) TYP (2) MAX (1) UNIT Output current IOCP Overcurrent protection TA = 25°C 1.5 2.3 3.0 A Output accuracy VFB Reference voltage TA = 25°C 0.784 0.8 0.816 V Temperature variation -40°C ≤ TA ≤ 85°C 0.784 0.8 0.816 V IFB Input current feedback pin -50 0 50 nA VOUT Line regulation VIN = VOUT+1 to 5.5V, MODE = low - 0.05 - %/V Load regulation 500mA < ILOAD < 1A - -0.9 - %/A Output voltage ripple VIN = 3.6V, VOUT = 1.8V, IOUT = 100mA MODE = high, 20MHz BW, TA = 25°C(5) - 6 - mV VIN = 3.6V, VOUT = 1.8V, IOUT = 100mA MODE = low, 20MHz BW, TA = 25°C(5) - 65 - mV Switching frequency fSW Switching frequency 3.6 4 4.4 MHz Enable and undervoltage lockout VUVLO VIN undervoltage threshold VIN increasing 2 2.2 2.4 V VIN undervoltage hysteresis TA = 25°C - 170 - mV VENABLE Enable threshold trip point Enable logic high voltage Enable logic low voltage IENABLE Enable input current -1 - 1 µA MODE selection VMODE MODE threshold trip point Mode logic high voltage Mode logic low voltage IMODE MODE current consumption MODE = high, TA = 25°C 75 nA MODE = low, TA = 25°C -60 nA Soft-Start tSS Soft-start duration TA = 25°C (rising edge to 95% of VOUT) 128 µs

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 6/39 ELECTRICAL SPECIFICATIONS MIN and MAX limits are valid for the recommended ambient temperature ran ge of -40°C to 85°C. Typical values represents statistically the utmost probable values at the following conditions: V IN = 5V, VOUT = 1.8V, CIN = COUT =10µF ceramic , unless otherwise noted. SYMBOL PARAMETER TEST CONDITIONS MIN (1) TYP (2) MAX (1) UNIT Efficiency η Efficiency VIN = 3.6V, VOUT = 1.8V, IOUT = 50mA MODE = low - 87 - % VIN = 5V, VOUT = 3.3V, IOUT = 50mA MODE = low - 90 - % VIN = 3.6V, VOUT = 1.8V, IOUT = 200mA, MODE = high - 88 - % VIN = 5V, VOUT = 3.3V, IOUT = 200mA, MODE = high - 90 - % VIN = 3.6V, VOUT = 3.3V, IOUT = 200mA, MODE = low - 96 - % Input quiescent/shutdown current ISD Shutdown quiescent current VENABLE = 0V, TA = 25°C, VIN = 5V - 0.5 - µA IIN No load input current MODE = high, EN = high, switching with no load, VOUT = 1.8V, TA = 25°C - 13 - mA MODE = low, EN = high , switching with no load, VOUT = 1.8V, TA = 25°C - 25 - µA IQ Quiescent current MODE = high, EN = high, no switching, VOUT = 1.8V, TA = 25°C - 25 - µA MODE = low, EN = high, no switching, VOUT = 1.8V, TA = 25°C - 25 - µA RoHS, REACh RoHS directive Directive 2011/65/EU of the European Parliament and the Council of June 8th, 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment. REACh directive Directive 1907/2006/EU of the European Parliament and the Council of June 1st, 2007 regarding the Registration, Evaluation, Authorization and Restriction of Chemicals (REACh) . PACKAGE SPECIFICATIONS Weight Molding compound UL class Certificate number 0.0416g None Not applicable Not applicable

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 7/39 NOTES (1) Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control (SQC) methods. (2) Typical numbers are valid at 25°C ambient temperature and represent statistically the utmost probable values assuming a Gaussian distribution. (3) Depending on heat sink design, number of PCB layers, copper thickness and air flow. (4) Measured on a 101.5 x 114.5 mm one layer board, with 70µm (2 ounce) copper, no air flow, according to JESD51-9. (5) The industry standard for comparison of the output voltage ripple between switching regulators or modules requires a 10µF ceramic (sometimes additional 1µF ceramic in parallel) at the point of load where the voltage measurement is done using an oscilloscope with its probe and probe jack designed for low voltage/high frequency (low impedance) measurement. The oscilloscopes bandwidth is limited at 20MHz.

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 8/39 TYPICAL PERFORMANCE CURVE S If not otherwise specified, the following conditions apply: V IN = 5V; C IN = 4.7µF X5R ceramic; C OUT = 10µF X5R ceramic, CFF = 22pF, TAMB = 25°C. RADIATED EMISSIONS EN55032 (CISPR -32) CLASS B COMPLIANT Measured with module on an Evaluation Board 178010502 in a Fully Anechoic Room (FAR) at 3m antenna distance . Without input filter 30 100 1000 Frequency [MHz] Radiated Emissions [dBµV/m] Radiated Emissions 171010502 (3m Antenna Distance ) VIN = 5V, VOUT = 3.3V, ILOAD = 1A without input filter Horizontal Vertical EN55032 Class A limit EN55032 Class B limit

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 9/39 With input filter 30 100 1000 Frequency [MHz] Radiated Emissions [dBµV/m] Radiated Emissions 171010502 (3m Antenna Distance ) VIN = 5V, VOUT = 3.3V, ILOAD = 1A Input Pi-FIlter: 22µF (885012107011), 1.5µH (74438343015) and 4.7µF (885012107013) Horizontal Vertical EN55032 Class A limit EN55032 Class B limit The diagram above refers only to forced PWM mode . Nevertheless similar resul ts would be obtained in PFM/PWM mode because at this load current (1A) there is no difference between the two modes .

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 10/39 EFFICIENCY 100 Efficiency [%] Output Current [A]

171010502 VIN = 5V, Forced PWM Mode T A = 25 C

Vout = 3.3V Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V 100 Efficiency [%] Output Current [A]

171010502 V IN = 5V, PFM/PWM Mode T A = 25 C

Vout = 3.3V Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 11/39 EFFICIENCY 100 Efficiency [%] Output Current [A] 171010502 VIN = 3.6V, Forced PWM Mode TA = 25 C Vout = 3.3V Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V 100 0,00 0,25 0,50 0,75 1,00 Efficiency [%] Output Current [A] 171010502 VIN = 3.6V, PFM/PWM Mode T A = 25 C Vout = 3.3V Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 12/39 EFFICIENCY 100 Efficiency [%] Output Current [A] 171010502 VIN = 3.3V, Forced PWM Mode TA = 25 C Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V 100 Efficiency [%] Output Current [A] 171010502 VIN = 3.3V, PFM/PWM Mode T A = 25 C Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 13/39 POWER DISSIPATION 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Power Dissipation [W] Output Current [A]

171010502 V IN = 5V, Forced PWM Mode T A = 25 C

Vout = 3.3V Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Power Dissipation [W] Output Current [A]

171010502 V IN = 5V, PFM/PWM Mode TA = 25 C

Vout = 3.3V Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 14/39 POWER DISSIPATION 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Power Dissipation [W] Output Current [A] 171010502 V IN = 3.6V, Forced PWM Mode TA = 25 C Vout = 3.3V Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Power Dissipation [W] Output Current [A] 171010502 VIN = 3.6V, PFM/PWM Mode T A = 25 C Vout = 3.3V Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 15/39 POWER DISSIPATION 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Power Dissipation [W] Output Current [A] 171010502 V IN = 3.3V, Forced PWM Mode TA = 25 C Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Power Dissipation [W] Output Current [A] 171010502 VIN = 3.3V, PFM/PWM Mode T A = 25 C Vout = 2.5V Vout = 1.8V Vout = 1.5V Vout = 1.2V

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 16/39 OUTPUT POWER DERATING Note: see TA limits in Operating Conditions on page 4. 0.0 0.2 0.4 0.6 0.8 1.0 1.2 0 10 20 30 40 50 60 70 80 90 100 110 120 130 Output current [A] Ambient Temperature [ C]

171010502 Current Thermal Derating

VIN = 3.6V, VOUT = 1.8V, θJA = 150 C/W

70 C 120 C

0.0 0.2 0.4 0.6 0.8 1.0 1.2 0 10 20 30 40 50 60 70 80 90 100 110 120 130 Output current [A] Ambient Temperature [ C] VIN = 5V, VOUT = 3.3V, θJA = 150 C/W

70 C 116 C

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 17/39 LOAD REGULATION LINE REGULATION 1.75 1.77 1.79 1.81 1.83 1.85 0 0.25 0.5 0.75 1 Output voltage [V] Output Current [A] 171010502 Load Regulation V IN = 3.6V, VOUT = 1.8V, TA = 25 C PFM/PWM Mode Forced PWM Mode PFM/PWM Mode Forced PWM Mode 1.75 1.76 1.77 1.78 1.79 1.80 1.81 1.82 1.83 1.84 1.85 Output voltage [V] Input Voltage [V] 171010502 Line Regulation V OUT = 1.8V, IOUT = 1A , TA = 25 C Forced PWM Mode PFM/PWM Mode

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 18/39 BLOCK DIAGRAM CIRCUIT DESCRIPTION The MagI³C MicroModule 171010502 is a synchronous step down regulator with integrated MOSFETs, a power inductor and an input capacitor . The control scheme is based on a Constant On-Time (COT) regulation loop . An additional mode for light load operatio n can be engaged based on the condition applied to the MODE pin. The VOUT of the regulator is divided by the feedback resistor network RFBT and RFBB and fed into the FB pin. The internal comparator compares this signal with the internal 0.8V reference. If the feedback voltage is below the reference, the high side MOSFET is turned on for a fixed on-time. The constant on -time control scheme does not require compensation circuitry which makes the overall design very simple. Nevertheless , it requires a certain minimum ripple at the feedback pin. The MagI³C Power Module 171010502 generates this ripple internally and is supported by the C FF capacitor which bypasses AC ripple directly to the feedback pin from the output. With this architecture very small output ripple values under 10mV (similar to current or voltage mode devices) can be achieved. SSSS VREF 0.8V SSOTP EA PWM Controller Driver Protections Compensation network VIN MODE PGND EN FB VOUT4 6 5 10.54µH 4.7µF CIN COUT CFFRFBT RFBB VIN SSUVLO PGND EP VOUT

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 19/39 DESIGN FLOW The next four simple steps will show how to select the external components to design the 171010502 application. Essential Steps 1. Set output voltage 2. Select input capacitor 3. Select output capacitor 4. Select the feed-forward capacitor VIN VOUT EN MODE CIN COUT RFBT FB PGND VIN VOUT RFBB CFF 2 3 GND GND PGND EP MODULE

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 20/39 Step 1 Setting the output voltage (V OUT) The output voltage is selected with a n external resistor divider between VOUT and GND (see circuit below) . The voltage across the lower resistor of the divider is provided to the FB pin and compared with a reference voltage of 0.8V (V FB). The output voltage adjustment range is from 0.8V to 5.5V. The output voltage can be calculated according to the following formula: VOUT =VFB∙(RFBT RFBB +1) One resistor must be chosen and then the other resistor can be calculated. For example, if RFBT = 100kΩ then the resistance value of the lower resistor in the feedback network is indicated in the table below for common output voltag es. VOUT PGND RFBB VOUT FB RFBT MODULE

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 21/39 Step 2 Select input capacitor (C IN) The energy at the input of the MicroModule is stored in the input capaci tor. An input capacitor (4.7µF) is integrated inside the 171010502 MagI³C MicroModule , ensuring good EMI performance and helping protect the internal circuitry from possible voltage transients . Additional input capacitance is required externally to provide cycle-by-cycle switch ing current and to support load transient s. The external input capacitor must be placed directly at the VIN pin. For this MagI³C MicroModule it is recommended to use a MLCC (Mutli Layer Ceramic Capacitor) of 4.7µF. Attention must be paid to the voltage, frequency and temperature deratings of the selected capacitor. Step 3 Select output capacitor (C OUT) The output capacitor should be selected in order to minimize the output voltage ripple and to provide a stable voltage at the output. It also affects the loop stability. An external MLCC of 10µF is recommended for all application conditions. Attention must be paid to the voltage, frequency and temperature deratings of the selected capacitor. In general , the output voltage ripple can be calculated using the following equation: VOUT ripple = ∆IL ∙ ESR+∆IL ∙ 1 8∙fSW∙COUT (1) where ∆IL is the inductor current ripple and can be calculated with the following equation: ∆IL= VOUT ∙ (VIN-VOUT) fSW ∙ L ∙ VIN (2) Example In the section OUTPUT VOLTAGE RIPPLE on page 27 a ripple measurement is shown under the following conditions: VIN = 3.6V VOUT = 1.8V L = 540nH fSW = 4MHz COUT = 10µF (external, Würth Elektronik, part number 885012107014 ) Assuming a reduction of the capacitance of about 10% due to the bias voltage, a rema ining capaci tance of around 9µF can be considered. Another assumpt ion can be done for the ESR, which can be considered lower than 5mΩ. Using equations (1) and (2), the expected ripple is VOUT ripple ≤ 2mV, which matches the results obtained with the measurement.

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 22/39 Step 4 Select the feed -forward capacitor (CFF) The 171010502 MagI³C Micromodule allows for the selection of a feed forward capacitor , CFF, providing a trade-off between response time and efficiency while also affecting the transition current thresho ld between the PFM and PWM modes. A lower value of CFF will increase the efficiency of the module at light load while slowing down the response time. Increasing the CFF value will speed up the response time while decreasing efficiency. Increasing the value of CFF result s in higher values of current needed to leave PFM mode. 22pF has been evaluated experimentally as a value with suitable efficiency and transient characteristics for most applications. The pictures below show the transient behavior of the 171 010502 in response to a load transition from 0A to 1A using the recommended CFF = 22pF, as well as other values of CFF. A higher value of CFF helps to reduce the over and undershoot just after the load transitions and allows the module to settle to the regulated output voltage in less time. This behavior is valid only for this test under the specified conditions and must be verified in the real application. -200 -150 -100 -50 100 150 200 -1,6 -1,4 -1,2 -1,0 -0,8 -0,6 -0,4 -0,2 0,0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 0 10 20 30 40 50 60 Output voltage AC [mV] Output current [A] Time [µs] Load Transient V IN = 5V, VOUT = 3.3V, from 0A to 1A, Forced PWM Mode, T A = 25 C IOUT CFF = 10pF CFF = 22pF CFF = 100pF CFF = 220pFVout -200 -150 -100 -50 100 150 200 -1,6 -1,4 -1,2 -1,0 -0,8 -0,6 -0,4 -0,2 0,0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 0 10 20 30 40 50 60 Output voltage AC [mV] Output current [A] Time [µs] Load Transient V IN = 5V, VOUT = 3.3V, from 1A to 0A, Forced PWM Mode, T A = 25 C IOUT VOUT CFF = 10pF CFF = 22pF CFF = 100pF CFF = 220pF

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 23/39 The CFF value only affects the efficiency during light load conditions when the PFM/PWM mo de is chosen. As explained in the section LIGHT LOAD OPERATION on page 23, under light load operation while PFM/PWM mode is selected (MODE pin tied to GND), the device does not continuously switch, instead delivering energy to the load in bursts. The frequency between bursts is influenced by various parameters, including the CFF value. The LIGHT LOAD OPERATION section provides a more in-depth explanation of the additional parameters which affect behavior in this region. Increasing C FF will cause the module to burst more often (shown in the two images above) resulting in a decrease in light load efficiency as depicted in the diagram b elow. In addition, increasing the C FF value will result in an increase in the current threshold required to exit PFM mode, also shown below as a difference of almost 100mA. While the recommended C FF value of 22pF will work for most applications, the user can adjust the performance of the module based on their application by trading between light load efficiency and transient response. This customization tailors the behavior of the module to the application’s needs. 0 4 8 12 16 20 24 Switch Node Voltage [V] Time [µs] VIN = 3.6V, VOUT = 1.8V, IOUT = 50mA, CFF = 22pF PFM Mode 9µs →110kHz 0,001 0,01 0,1 Efficiency [%] Output Current [A] VIN = 5.5V , VOUT = 3.3V Graph, TA = 25 °C 22pF 220pF 0 4 8 12 16 20 24 Switch Node Voltage [V] Time [µs] VIN = 3.6V, VOUT = 1.8V, IOUT = 50mA, CFF = 220pF PFM Mode 6.5µs →150kHz

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 24/39 MODES OF OPERATION The MODE pin of the 171010502 can be pulled either high or low to alter the light load performance of the module based on the application requirements . Forced PWM mode Pulling the MODE pin high selects the forced PWM mode. In this mode the device constantly functions in PWM mode, switching at the default 4 MHz fixed switching frequency, independently o f the load (see figure below). This mode of operation eases the filtering requirement s to help with noise sensitive applications. Behavior at varying input voltages During PWM operation , if the duty cycle is under a certain value, typically 76%, the module controls the off-time based on the feedback ripple compared to an internal reference that utilizes the inductor ripple. The on-time is fixed and depends on V IN and VOUT as well as the fixed switching frequency of 4MHz, as indicated by the following equation: 𝑡𝑜𝑛= 𝑉𝑜𝑢𝑡 𝑉𝑖𝑛∗𝑓𝑠𝑤 When the input voltage decreases (such as with a discharging battery) the duty cycle will increase to deliver the same amount of power to the load. When the duty cycle reaches a critical point, typically 76%, the module transitions to a fixed off-time mode where it controls the low-side switch using the feedback ripple and internal comparator , keeping the low-side switch off for a fixed 60ns and varying the on -time to meet the duty cycle requirements and output voltage. This results in a decrease of switching frequency as the duty cycle continues to increase. If the input voltage decreases further and the difference between the input voltage and output voltage is not significantly large, such that the duty cycle approaches 100% operation, the module enters a drop-out mode of operation, leaving the high -side switch on continuously and regulating the output voltage using the combined DC resistance of the high -side switch and the integrated inductor. -0,6 -0,4 -0,2 0,0 0,2 0,4 0,6 0 1 2 3 4 5 Inductor Current [A] Time [µs] VIN = 3.6V, VOUT = 1.8V, IOUT = 100mA, forced PWM Mode

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 25/39 PFM/PWM mode Setting the MODE pin low selec ts the PFM/PWM mode. This mode provides a much higher efficiency at light loads (shown in the picture below) by using PFM mode to save energy. During PFM mode the module delivers energy in short bursts to the load (see the figure below). Within each burs t the device switches at the default switching frequency and the energy is delivered to both the load and the output capacitor. In between bursts , the device experiences a period where both the high side and low side switches are in an off state. The load demands are supplied exclusively by the output capacitor during this time and the current consumption of the device drops dramatically until the feedback system triggers the next cycle. This behavior results in higher efficiency than traditional PWM operation can deliver. 100 0,001 0,01 0,1 Efficiency [%] Output Current [A] 171010502 Vin = 5V Vout = 1.8V, PFM vs Forced PWM Mode, TA = 25°C PFM Mode Forced PWM Mode -80 -70 -60 -50 -40 -30 -20 -10 0,0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0 0 2 4 6 8 10 12 14 16 18 20 22 24 FB Voltage AC coupled [mV] Inductor Current [A] Time [µs] VIN = 3.6V, VOUT = 1.8V, IOUT = 50mA, PFM Mode BU T= BU T

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 26/39 Please consider that the dead times shown above are examples and measured values are heavily dependent on several parameters including the output capacitor , routing techniques, distance between the output capacitor and load, and the feed- forward capacitor. The device transitions from PFM to PWM mode automatically when the dead time approaches zero, resuming constant switching behavior at the default switching frequency of 4MHz. -80 -70 -60 -50 -40 -30 -20 -10 0,0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0 0 2 4 6 8 10 12 14 16 18 20 22 24 FB Voltage (AC coupled) [mV] Inductor Current [A] Time [µs] VIN = 3.6V, VOUT = 1.8V, IOUT = 100mA, PFM Mode BU T=1 BU T

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 27/39 OUTPUT VOLTAGE RIPPLE The output voltage ripple is also influenced by the selection of the MODE pin. If the forced PWM mode is selected and the duty cycle is below 76% , the ripple is very low and it always has the same frequency as the internal oscillator (4 MHz). If the PFM/PWM mode is selected and the load current is low enough to be in the PFM mode of operation or if the duty cycle is high enough to enter the constant off-time mode of operation then the output voltage ripple will be higher and the frequency lower than the nominal switching frequenc y (see pictures below). Ripple in PFM/PWM mode Ripple in forced PWM mode -100 -80 -60 -40 -20 100 0 10 20 30 40 50 Output Voltage Ripple [mV] Time [µs] VIN = 3.6V, VOUT = 1.8V, IOUT = 100mA COUT = 10µF PFM Mode 65mV = BU T=1 BU T -20 -15 -10 Output Voltage Ripple [mV] Time [µs] VIN = 3.6V, VOUT = 1.8V, IOUT = 100mA COUT = 10µF Forced PWM Mode 6mV

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 28/39 PROTECTIVE FEATURES Overcurrent protection (OCP) For protection agains t load faults, the MagI³C MicroModule incorporates a cycle-by-cycle current limiting (see IOCP in “Electrical Specification” on page 5). During switching , the output current is limited by turning off the high -side switch when the current limit value is detected. This switching behavior continues, limiting the on-time of the device until the overcurrent condition is removed. When the overcurrent condition is removed normal switching times resume s. The output voltage is reduced to zero until the current no longer exceeds the limit . Short-circuit protection (SCP) When the MagI³C MicroModule experiences a short -circuit condition at the output it will limit the current, typically to 2.2A, until the thermal protection circuit shuts the module off. If the short-circuit condition is removed, normal switching operation will begin if the module temperature is not exceeding the thermal shutdown threshold. 0 2 4 6 8 10 12 Output Current [A] Output Voltage [V] Time [ms] VIN = 3.6V, VOUT = 1.8V, IOUT > 2A overcurrent output voltage drop 0 2 4 6 8 10 12 Output Current [A] Output Voltage [V] Time [ms] VIN = 3.6V, VOUT = 1.8V, short circuit short circuit event output voltage drop current limited

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 29/39 Over temperature protection (OTP) Thermal protection helps prevent catastrophic failures due to accidental device overheating . The junction temperature of the MagI³C MicroModule should not be allowed to exceed its maximum ratings. Thermal protection is implemented by an internal thermal shutdo wn circuit, which activates when the junction temperature reaches 160°C (typ). Under the thermal shutdown condition both MOSFETs remain off causing VOUT to drop. When the junction temperature falls below 15 0°C the internal soft- start is released, VOUT rises smoothly, and normal operation resumes. Input undervoltage lockout The device inco rporates undervoltage l ockout (UVLO) to protect unexpected behavior at input voltages below the recommended values . The thresholds of the UVLO are indicated in the Electrical Specifications on page 5. Soft-Start The 171010502 implements an internal soft-start in order to limit the inrush current and avoid output voltage overshoot during start-up. The typical duration of the soft-start is around 100µs (see figure below) . Enable The 171010502 MagI³C MicroModule is enabled by setting the pin EN high. After setting EN high the module prepares for operation, a process which takes roughly 10 0µsec . Once prepared, the module begins switching and the internal soft-start regulates the output voltage rise until the desired output voltage is met allowing normal operation to take place . 0 100 200 300 400 500 600 VEN, VOUT [V] Time [µs] VIN = 3.6V, VOUT = 1.8V VEN VOUT tSS

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 30/39 LAYOUT RECOMMENDATION CIN COUT CFF RFBT RFBB PGND EN VIN FB MODE VOUTGND VIN VOUT GND MagI³C Power Module Bottom GROUND PLANE Bottom layer Top layer Pads The picture above shows a possible layout for the 171010502 MagI3C MicroModule. Nevertheless , some recommendations should be followed when designing the layout: 1. The exposed pad should be connected to the bottom copper layer of the circuit board with enough vias to assist the module in dissipating heat during operation. The above example uses 9 vias each with a drill diameter of 200µm. 2. The input and output capacitors should be placed as close as possible to the VIN and VOUT pins of the device. 3. The feedback resistor divider should be placed as close as possible to the FB pin 4. Pins 5 and 2 (EN and MODE respectively) must be always connected to either VIN or ground and they cannot be left floating (an example is show n in the layout depicted above, where EN and MODE pins are respectively connected to VIN and ground).

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 31/39 EVALUATION BOARD SCHEMATIC VIN VOUT EN MODEC1 C3 RFBT FB PGND VIN VOUT RFBB CFF GND GND PGND EP MODULE Operational Requirements The additional aluminum polymer capacitor C1 is only for evaluation board protection purposes. It is mounted at the termination of the supply line and provides slight damping of possible oscillations of the series resonance circuit represented by the inductance of the supply line and the input capacitance . It is not essential for operation but will provide better performance in a testing environment. Bill of Material Designator Description Quantity Order Code Manufacturer IC1 MagI3C MicroModule 1 171010502 Würth Elektronik C1 Aluminum Polymer Capacitor 220µF/10V 1 875105244013 Würth Elektronik C2 Ceramic chip capacitor 4.7µF/16V X5R, 0805 1 885012107013 Würth Elektronik C3 Ceramic chip capacitor 10µF/16V X5R, 0805 1 885012107014 Würth Elektronik Ceramic chip capacitor 10µF/10V X5R, 0805(*) 885012107010 Würth Elektronik CFF Ceramic chip capacitor 22pF/25V NP0/COG 0603 1 RFBT 24.9 kΩ 1 RFBB Set by jumper open for VOUT = 0.8V 97.6 kΩ for VOUT = 1.0V 1 48.7 kΩ for VOUT = 1.2V 1 28 kΩ for VOUT = 1.5V 1 19.6 kΩ for VOUT = 1.8V 1 11.5 kΩ for VOUT = 2.5V 1 7.87 kΩ for VOUT = 3.3V 1 To be soldered for adjustable output voltage RFBB= RFBT VOUT VFB - 1 J1 Jumper for MODE connection to either VIN (Forced PWM) or GND (PFM/PWM) 1 J2 Jumper for EN connection to either VIN (device enabled) or GND (device disabled) 1 (*) alternative recommended part

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 32/39 HANDLING RECOMMENDATIONS 1. The power module is classified as MSL1 (JEDEC Moisture Sensitivity Level 1) and requires special h andling due to moisture sensitivity (JEDEC J-STD033). 2. The parts are delivered in a sealed bag (Moisture Barrier Bags = MBB) and should be processed within one year. 3. When opening the moisture barrier bag check the Humidity Indicator Card (HIC) for color sta tus. Bake parts prior to soldering in case indicator color has changed according to the notes on the card. 4. Parts must be processed after 168 hour (7 days) of floor life. Once this time has been exceeded, bake parts prior to soldering per JEDEC J-STD033 recommendation. SOLDER PROFILE 1. Only Pb-Free assembly is recommend ed according to JEDEC J-STD020. 2. Measure the peak reflow temperature of the MagI³C MicroModule in the middle of the top view. 3. Ensure that the peak reflow temperature does not exceed 235°C ±5°C as per JEDEC J-STD020. 4. The reflow time period during peak temperature of 235°C ±5°C must not exceed 20 seconds. 5. Reflow time above liquidus (217 °C) must not exceed 90 seconds. 6. Maximum ramp up is rate 3°C per second. 7. Maximum ramp down rate is 3°C per second. 8. Reflow time from room (25°C) to peak must not exceed 8 minutes as per JEDEC J-STD020. 9. Maximum numbers of reflow cycles is three. 10. For minimum risk, solder the module in the last reflow cycle of the PCB production. 11. For soldering process please consider lead material copper (Cu) and lead finish tin (Sn). / 89%) type 3 or higher. 13. The profile shown below is valid for convection reflow only. 14. Other sold ering methods (e.g.vapor phase) are not verified and have to be validated by the customer at their own risk. Temperature [°C] Time [sec] 150 180 217 Max 240 Max 90 sec Min 60 sec Max 90 sec Min 60 sec Max 20 sec 230°C Ramp Up Rate Ramp Down Rate Max 3 solder cycles ! Preheat Liquidus Peak Max 3°C/sec Max 3°C/sec

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 33/39 PHYSICAL DIMENSIONS Bottom view All dimensions in mm, tolerances ±0.1mm All dimensions in mm

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 34/39 EXAMPLE FOOTPRINT DESIGN All dimensions in mm

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 35/39 PACKAGING Reel (mm) 20P A B C D N W1 W2 W3

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 36/39 Tape (mm) A0 B0 W P1 T T1 T2 D0 E1 E2 F P0 P2 Tape Packaging Unit

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 37/39 DOCUMENT HISTORY Revision Date Description Comment

1.0 January 2019 Initial datasheet released

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 38/39 CAUTIONS AND WARNING S The following conditions apply to all goods within the product series of MagI³C of Würth Elektronik eiSos GmbH & Co. KG: General:

  • All recommendations according to the general technical specifications of the data-sheet have to be complied with.
  • The usage and operation of the product within ambient conditions which probably alloy or harm the component surface has to be avoided.
  • Electronic components that will be used in safety -critical or high -reliability applications, should be pre -evaluated by th e customer.
  • The component is designed and manufactured to be used within the datasheet specified values. If the usage and operation conditions specified in the datasheet are not met,the component may be damaged or dissolved.
  • Do not drop or impact the components as material of the body, pins or termination may flake apart.
  • Würth Elektronik products are qualified according to international standards, which are listed in each product reliability report. Würth Elektronik does not warrant any customer qualified product characteristics beyond Würth Elektroniks’ specifications, for its validity and sustainability over time.
  • The responsibility for the applicability of the customer specific products and use in a particular customer design is alway s within the authority of the customer. All technical specifications for standard products also apply to customer specific products.
  • Customer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety -related requirem ents concerning its products, and any use of Würth Elektronik eiSos GmbH & Co. KG components in its applications, notwithstanding any applications -related information or support that may be provided by Würth Elektronik eiSos GmbH & Co. KG. Customer represe nts and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failures, monitor failures and their consequences lessen the likelihood of failures that might cause harm and take appropri ate remedial actions. Customer will fully indemnify Würth Elektronik eiSos and its representatives against any damages arising out of the use of any Würth Elektronik eiSos GmbH & Co. KG components in safety-critical applications. Product specific: Follow all instructions mentioned in the datasheet, especially:
  • The solder profile has to comply with the technical reflow or wave soldering specification, otherwise this will void the warranty.
  • All products are supposed to be used before the end of the period of 12 months based on the product date-code.
  • Violation of the technical product specifications such as exceeding the absolute maximum ratings will void the warranty.
  • It is also recommended to return the body to the original moisture proof bag and reseal the moisture proof bag again.
  • ESD prevention methods need to be followed for manual handling and processing by machinery.
  • Residual washing varnish agent that is used during the production to clean the application might change the characteristics of the body, pins or termination. The washing varnish agent could have a negative effect on the long term function of the product.
  • Direct mechanical impact to the product shall be prevented as the material of the body, pins or termination could flake or in the worst case it could break. As these devices are sensitive to electrostatic discharge customer shall follow proper IC Handling Procedures. DISCLAIMER This electronic component has been designed and developed for usage in general electronic equipme nt only. This product is not authorized for use in equipment where a higher safety standard and reliability standard is especially required or where a failure of the product is reasonably expected to cause severe personal injury or death, unless the partie s have executed an agreement specifically governing such use. Moreover Würth Elektronik eiSos GmbH & Co KG products are neither designed nor intended for use in areas such as military, aerospace, aviation, nuclear control, submarine, transportation (automo tive control, train control, ship control), transportation signal, disaster prevention, medical, public information network etc.. Würth Elektronik eiSos GmbH & Co KG must be informed about the intent of such usage before the design -in stage. In addition, sufficient reliability evaluation checks for safety must be performed on every electronic component which is used in electrical circuits that require high safety and reliability functions or performance. These cautions and warnings comply with the state of the scientific and technical knowledge and are believed to be accurate and reliable. However, no responsibility is assumed for inaccuracies or incompleteness.

VDMM – Variable Step Down MicroModule we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0 © January 2019 39/39 IMPORTANT NOTES The following conditions apply to all goods within the product range of Würth Elektronik eiSos GmbH & Co. KG: 1. General Customer Responsibility Some goods within the product range of Würth Elektronik eiSos GmbH & Co. KG contain statements regarding general suitability for certain application areas. These statements about suitab ility are based on our knowledge and experience of typical requirements concerning the areas, serve as general guidance and cannot be estimated as binding statements about the suitability for a customer application. The responsibility for the applicability and use in a particular customer design is always solely within the authority of the customer. Due to this fact it is up to the customer to evaluate, where appropriate to investigate and decide whether the device with the specific product characteristics described in the product specification is valid and suitable for the respective customer application or not. Accordingly, the customer is cautioned to verify that the datasheet is current before placing orders. 2. Customer Responsibility related to Specific, in particular Safety-Relevant Applications It has to be clearly pointed out that the possibility of a malfunction of electronic components or failure before the end of the usual lifetime cannot be completely eliminated in the current state of the art, even if the products are operated within the range of the specifications. In certain customer applications requiring a very high level of safety and especially in customer applications in which the malfunction or failure of an electronic component could endanger human life or health it must be ensured by most advanced technological aid of suitable design of the customer application that no injury or damage is caused to third parties in the event of malfunction or failure of an electronic component. 3. Best Care and Attention Any product-specific notes, warnings and cautions must be strictly observed. Any disregard will result in the loss of warranty. 4. Customer Support for Product Specifications Some products within the product range may contain substances which are subject to restrictions in certain jurisdictions in order to serve specific technical requirements. Nece ssary information is available on request. In this case the field sales engineer or the internal sales person in charge should be contacted who will be happy to support in this matter. 5. Product R&D Due to constant product improvement product specifications may change from time to time. As a standard reporting procedure of the Product Change Notification (PCN) according to the JEDEC -Standard we inform about minor and major changes. In case of further queries regarding the PCN, the field sales engineer or the internal sales person in charge should be contacted. The basic responsibility of the customer as per Section 1 and 2 remains unaffected. 6. Product Life Cycle Due to technical progress and economical evaluation we also reserve the right to discontinue production and delivery of products. As a standard reporting procedure of the Product Termination Notification (PTN) according to the JEDEC -Standard we will inform at an early stage about inevitable product discontinuance. According to this we cannot guarantee that all products within our product range will always be available. Therefore it needs to be verified with the field sales engineer or the int ernal sales person in charge about the current product availability expectancy before or when the product f or application design -in disposal is considered. The approach named above does not apply in the case of individual agreements deviating from the foregoing for customer -specific products. 7. Property Rights All the rights for contractual products produced by Würth Elektronik eiSos GmbH & Co. KG on the basis of ideas, development contracts as well as models or templates that are subject to copyright, patent or commercial protection supplied to the customer will remain with Würth Elektronik eiSos GmbH & Co. KG. Würth Elektronik eiSos GmbH & Co. KG does not warrant or represent that any license, either expressed or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right relating to any combination, application, or process in which Würth Elektronik eiSos GmbH & Co. KG components or services are used. 8. General Terms and Conditions Unless otherwise agreed in individual contracts, all orders are subject to the current version of the “General Terms and Condition s of Würth Elektronik eiSos Group”, last version available at www.we-online.com.